/* =====================================================================
   goestoai.com — style.css
   순서: 토큰 → 베이스 → 컴포넌트 → 섹션 → 반응형 → 접근성/모션
   값은 design-system 스킬의 토큰 이름을 그대로 사용한다.
   ===================================================================== */

/* ============================ 1. 토큰 ============================ */
:root {
  /* 컬러 */
  --c-bg: #FAFAFC;
  --c-surface: #FFFFFF;
  --c-ink: #16181F;
  --c-ink-soft: #4B5162;
  --c-primary: #4F46E5;
  --c-primary-ink: #FFFFFF;
  --c-accent: #06B6D4;
  --c-deep: #0B1020;
  --c-deep-ink: #E8EAF4;
  --c-line: #E4E6EF;
  --grad-path: linear-gradient(135deg, var(--c-primary), var(--c-accent));

  /* 타이포 */
  --font-sans: "Pretendard Variable", Pretendard, -apple-system, "Segoe UI",
    Roboto, "Noto Sans KR", "Helvetica Neue", Arial, sans-serif;
  --fs-hero: clamp(2.2rem, 5.5vw, 4rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.25rem);
  --fs-body: clamp(1rem, 1.1vw, 1.125rem);
  --fs-small: 0.875rem;

  /* 간격 (4px 스케일) */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 24px;
  --sp-7: 28px;
  --sp-8: 32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;
  --section-pad: clamp(64px, 10vw, 128px);
  --container-pad: clamp(20px, 4vw, 40px);
  --container-max: 1120px;
  --header-h: 64px;

  /* 형태 */
  --r-card: 16px;
  --r-input: 12px;
  --r-pill: 999px;
  --shadow-card: 0 1px 2px rgb(11 16 32 / .04), 0 8px 24px rgb(11 16 32 / .06);
  --shadow-card-hover: 0 2px 4px rgb(11 16 32 / .06), 0 16px 40px rgb(11 16 32 / .12);

  /* 모션 */
  --dur-fast: 150ms;
  --dur-base: 300ms;
  --dur-slow: 600ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================ 2. 베이스 ============================ */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--sp-4));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 700;
}

p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

img, svg { display: block; max-width: 100%; }

button { font-family: inherit; }

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 헤더 그림자 감지용 센티넬 (스크롤 리스너 대체) */
#top-sentinel {
  position: absolute;
  top: 0; left: 0;
  width: 1px; height: 1px;
  pointer-events: none;
}

/* 언어 전환 크로스페이드 (main 전체, 200ms 왕복) */
#main { transition: opacity 100ms var(--ease-out); }
body.lang-switching #main { opacity: 0; }

/* ============================ 3. 컴포넌트 ============================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.eyebrow {
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-primary);
  margin: 0 0 var(--sp-3);
}

/* 섹션 헤딩 블록 */
.section { padding-block: var(--section-pad); }
.section__head { max-width: 65ch; margin-bottom: var(--sp-12); }
.section__title { font-size: var(--fs-h2); }
.section__lead {
  margin-top: var(--sp-4);
  color: var(--c-ink-soft);
  max-width: 65ch;
}

/* 버튼 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 14px 28px;
  border-radius: var(--r-pill);
  font-size: var(--fs-body);
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out),
    filter var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn--primary {
  background-image: var(--grad-path);
  color: var(--c-primary-ink);
  box-shadow: 0 6px 18px rgb(79 70 229 / .28);
}
.btn--primary:hover { filter: brightness(1.08); transform: translateY(-2px); }
.btn--ghost {
  background: transparent;
  color: var(--c-deep-ink);
  border-color: rgb(232 234 244 / .3);
}
.btn--ghost:hover { border-color: var(--c-accent); transform: translateY(-2px); }

/* 스크롤 리빌 (공통) */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}
.reveal.is-visible { opacity: 1; transform: none; }
/* 그룹 스태거 (항목 간 ≤ 100ms) */
.values .value:nth-child(2),
.pillar-grid .pillar-card:nth-child(2),
.points .point:nth-child(2) { transition-delay: 80ms; }
.pillar-grid .pillar-card:nth-child(3) { transition-delay: 160ms; }
.pillar-grid .pillar-card:nth-child(4) { transition-delay: 240ms; }
.values .value:nth-child(3) { transition-delay: 160ms; }

/* ---- 헤더 ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgb(250 250 252 / .8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-line);
  transition: box-shadow var(--dur-fast) var(--ease-out);
}
.site-header.is-scrolled { box-shadow: 0 6px 20px rgb(11 16 32 / .06); }

.nav {
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
}
.nav__logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--c-ink);
  white-space: nowrap;
}
.nav__links { display: none; }
.nav__links a {
  position: relative;
  color: var(--c-ink-soft);
  font-weight: 500;
  font-size: var(--fs-small);
  padding: var(--sp-2) 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 2px;
  background: var(--c-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-out);
}
.nav__links a:hover { color: var(--c-ink); }
.nav__links a:hover::after { transform: scaleX(1); }
.nav__links a[aria-current="true"] { color: var(--c-ink); }
.nav__links a[aria-current="true"]::after { transform: scaleX(1); }

.nav__actions { display: flex; align-items: center; gap: var(--sp-3); }
.nav__cta { display: none; padding: 10px 20px; font-size: var(--fs-small); }

/* ---- 언어 토글 ---- */
.lang-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: var(--sp-1);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-pill);
}
.lang-toggle__indicator {
  position: absolute;
  top: var(--sp-1);
  bottom: var(--sp-1);
  left: var(--sp-1);
  width: calc(50% - var(--sp-1));
  background: var(--c-primary);
  border-radius: var(--r-pill);
  transform: translateX(0);
  transition: transform var(--dur-fast) var(--ease-out);
}
.lang-toggle[data-active="en"] .lang-toggle__indicator { transform: translateX(100%); }
.lang-toggle__seg {
  position: relative;
  z-index: 1;
  min-width: 44px;
  min-height: 44px;
  padding: var(--sp-2) var(--sp-3);
  background: transparent;
  border: 0;
  border-radius: var(--r-pill);
  font-size: var(--fs-small);
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-ink-soft);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out);
}
.lang-toggle__seg[aria-pressed="true"] { color: var(--c-primary-ink); }

/* ============================ 4. 섹션 ============================ */

/* ---- HERO (다크) ---- */
.hero {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  color: var(--c-deep-ink);
  padding-block: clamp(88px, 14vw, 168px);
}
.hero__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.hero__bg::after {
  /* 모바일: 하단에서 위로 흐르는 은은한 길 글로우 */
  content: "";
  position: absolute;
  left: 50%; bottom: -20%;
  width: 120%; height: 70%;
  transform: translateX(-50%);
  background: radial-gradient(60% 50% at 50% 100%, rgb(79 70 229 / .35), transparent 70%);
}
.hero__path {
  position: absolute;
  right: -12%;
  top: 0;
  width: 75%;
  height: 100%;
  opacity: .55;
}
.hero__node { fill: #8FE9FF; }
.hero__flow {
  stroke-dasharray: 46 520;
  stroke-dashoffset: 566;
  opacity: .9;
  filter: drop-shadow(0 0 6px rgb(143 233 255 / .7));
  animation: heroFlow 7s linear infinite;
}
@keyframes heroFlow { to { stroke-dashoffset: 0; } }

.hero__inner { position: relative; z-index: 1; }
.hero__content { max-width: 42rem; }
.hero__eyebrow { color: var(--c-accent); }
.hero__title {
  font-size: var(--fs-hero);
  font-weight: 800;
  color: var(--c-deep-ink);
  margin-bottom: var(--sp-6);
}
.hero__subtitle {
  font-size: var(--fs-body);
  color: rgb(232 234 244 / .82);
  max-width: 65ch;
  margin-bottom: var(--sp-8);
}
.hero__cta { display: flex; flex-direction: column; gap: var(--sp-3); }
.hero__cta .btn { width: 100%; }

/* HERO 진입 스태거 (로드 시) */
.hero__content > * {
  opacity: 0;
  transform: translateY(24px);
}
body.is-ready .hero__content > * {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
}
body.is-ready .hero__eyebrow { transition-delay: 0ms; }
body.is-ready .hero__title { transition-delay: 80ms; }
body.is-ready .hero__subtitle { transition-delay: 160ms; }
body.is-ready .hero__cta { transition-delay: 240ms; }

/* ---- MISSION ---- */
.mission { background: var(--c-bg); }
.values { display: grid; grid-template-columns: 1fr; gap: var(--sp-8); }
.value { display: flex; flex-direction: column; align-items: flex-start; gap: var(--sp-3); }
.value__icon {
  display: inline-flex;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border-radius: var(--r-input);
  background: rgb(79 70 229 / .08);
  color: var(--c-primary);
}
.value__icon svg { width: 24px; height: 24px; }
.value__title { font-size: 1.125rem; font-weight: 600; }
.value__body { color: var(--c-ink-soft); }

/* ---- PILLARS ---- */
.pillars { background: var(--c-surface); }
.pillar-grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); align-items: stretch; }
.pillar-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-8);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out);
}
.pillar-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgb(6 182 212 / .4);
}
.pillar-card__tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--c-primary);
  padding: var(--sp-1) var(--sp-3);
  background: rgb(79 70 229 / .08);
  border-radius: var(--r-pill);
}
.pillar-card__icon {
  display: inline-flex;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--c-ink);
  transition: color var(--dur-fast) var(--ease-out);
}
.pillar-card:hover .pillar-card__icon { color: var(--c-accent); }
.pillar-card__icon svg { width: 26px; height: 26px; }
.pillar-card__title { font-size: 1.1875rem; font-weight: 700; }
.pillar-card__body { color: var(--c-ink-soft); font-size: var(--fs-small); line-height: 1.65; }

/* EN 로케일: 태그와 title이 동일 문자열이 되므로 태그 배지를 숨김
   (KO는 한국어 제목 + 영문 태그 병기, EN은 통일 → 중복 노출 방지) */
html[lang="en"] .pillar-card__tag { display: none; }

/* ---- JOURNEY (인터랙티브 스텝퍼) ---- */
.journey { background: var(--c-bg); }
.stepper { position: relative; margin-top: var(--sp-4); }

.stepper__nodes {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: var(--sp-3);
  z-index: 1;
}
.stepper__rail {
  position: absolute;
  top: 0;
  left: 0; right: 0;
  height: 48px;
  z-index: 0;
  pointer-events: none;
}
.stepper__rail-base,
.stepper__rail-fill {
  position: absolute;
  top: 50%;
  left: 24px; right: 24px;
  height: 3px;
  transform: translateY(-50%);
  border-radius: 3px;
}
.stepper__rail-base { background: var(--c-line); }
.stepper__rail-fill {
  background-image: var(--grad-path);
  transform: translateY(-50%) scaleX(var(--journey-progress, 0));
  transform-origin: left center;
  transition: transform var(--dur-base) var(--ease-out);
}

.stepper__node {
  position: relative;
  flex: 0 0 auto;
  width: 48px; height: 48px;
  display: inline-flex;
  align-items: center; justify-content: center;
  border-radius: var(--r-pill);
  border: 2px solid var(--c-line);
  background: var(--c-surface);
  color: var(--c-ink-soft);
  cursor: pointer;
  transition: transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    background-color var(--dur-base) var(--ease-out),
    color var(--dur-base) var(--ease-out);
}
.stepper__num { font-weight: 700; font-size: 1rem; }
.stepper__node.is-done,
.stepper__node.is-active {
  background-image: var(--grad-path);
  border-color: transparent;
  color: var(--c-primary-ink);
}
.stepper__node.is-active {
  box-shadow: 0 0 0 6px rgb(79 70 229 / .16), 0 8px 20px rgb(79 70 229 / .3);
  animation: stepPop var(--dur-base) var(--ease-out);
}
/* 활성 전환 시 노드 팝 (스펙 6.4b/c · #11: scale 1 → 1.08 → 1) */
@keyframes stepPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.stepper__node:hover { border-color: var(--c-primary); }
.stepper__node.is-active:hover { border-color: transparent; }

.stepper__panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-6);
  margin-top: var(--sp-8);
}
.stepper__card {
  padding: var(--sp-6);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  opacity: .62;
  transition: opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out);
}
.stepper__card.is-active {
  opacity: 1;
  border-color: rgb(79 70 229 / .4);
  box-shadow: var(--shadow-card);
}
.stepper__card:hover { transform: translateY(-4px); }
.stepper__card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  margin-bottom: var(--sp-2);
}
.stepper__card-body { color: var(--c-ink-soft); font-size: var(--fs-small); line-height: 1.65; }

/* ---- GLOBAL ---- */
.global { background: var(--c-surface); }
.global__grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-12); align-items: center; }
.points { display: grid; gap: var(--sp-6); margin-top: var(--sp-10); }
.point { display: flex; align-items: flex-start; gap: var(--sp-4); }
.point__icon {
  flex: 0 0 auto;
  display: inline-flex;
  width: 44px; height: 44px;
  align-items: center; justify-content: center;
  border-radius: var(--r-input);
  background: rgb(6 182 212 / .1);
  color: var(--c-accent);
}
.point__icon svg { width: 24px; height: 24px; }
.point__title { font-size: 1.0625rem; font-weight: 600; margin-bottom: var(--sp-1); }
.point__body { color: var(--c-ink-soft); font-size: var(--fs-small); }

/* KO/EN 데모 비주얼 */
.global__demo { display: flex; justify-content: center; }
.lang-demo {
  position: relative;
  width: 100%;
  max-width: 420px;
  min-height: 200px;
  display: grid;
  place-items: center;
  padding: var(--sp-10) var(--sp-8);
  background: var(--c-bg);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  overflow: hidden;
}
.lang-demo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-path);
  opacity: .05;
}
.lang-demo__tag {
  position: absolute;
  top: var(--sp-4); left: var(--sp-5);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--c-ink-soft);
}
.lang-demo__tag--en { left: auto; top: auto; bottom: var(--sp-4); right: var(--sp-5); }
.lang-demo__line {
  grid-area: 1 / 1;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  color: var(--c-primary);
  transition: opacity var(--dur-base) var(--ease-out),
    transform var(--dur-base) var(--ease-out);
}
.lang-demo__line--en { opacity: 0; transform: translateY(8px); }
.lang-demo[data-show="en"] .lang-demo__line--ko { opacity: 0; transform: translateY(-8px); }
.lang-demo[data-show="en"] .lang-demo__line--en { opacity: 1; transform: none; }

/* ---- CTA (다크) ---- */
.cta {
  position: relative;
  overflow: hidden;
  background: var(--c-deep);
  color: var(--c-deep-ink);
}
.cta__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(60% 80% at 50% 0%, rgb(6 182 212 / .22), transparent 60%);
}
.cta__inner { position: relative; z-index: 1; max-width: 720px; text-align: center; }
.cta__title { font-size: var(--fs-h2); color: var(--c-deep-ink); }
.cta__body {
  margin: var(--sp-5) auto var(--sp-8);
  color: rgb(232 234 244 / .82);
  max-width: 60ch;
}
.cta__form {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  max-width: 480px;
  margin-inline: auto;
}
.cta__input {
  flex: 1 1 auto;
  padding: 14px 18px;
  border-radius: var(--r-input);
  border: 1px solid rgb(232 234 244 / .28);
  background: rgb(255 255 255 / .06);
  color: var(--c-deep-ink);
  font-size: var(--fs-body);
  font-family: inherit;
  transition: border-color var(--dur-fast) var(--ease-out),
    background-color var(--dur-fast) var(--ease-out);
}
.cta__input::placeholder { color: rgb(232 234 244 / .6); }
.cta__input:focus-visible { border-color: var(--c-primary); background: rgb(255 255 255 / .1); }
.cta__submit { flex: 0 0 auto; }
.cta__status {
  min-height: 1.5em;
  margin-top: var(--sp-4);
  font-size: var(--fs-small);
  color: var(--c-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
}
.cta__status svg { width: 18px; height: 18px; }
.cta__status:empty { margin-top: 0; }

/* ---- FOOTER (cta와 연속 다크) ---- */
.site-footer {
  background: var(--c-deep);
  color: rgb(232 234 244 / .62);
  padding-block: var(--sp-16) var(--sp-10);
}
.site-footer__inner { display: grid; gap: var(--sp-8); }
.site-footer__logo {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--c-deep-ink);
}
.site-footer__tagline { margin-top: var(--sp-2); font-size: var(--fs-small); max-width: 40ch; }
.site-footer__links { display: flex; flex-wrap: wrap; gap: var(--sp-5); }
.site-footer__links a {
  position: relative;
  font-size: var(--fs-small);
  color: rgb(232 234 244 / .62);
  transition: color var(--dur-fast) var(--ease-out);
}
.site-footer__links a:hover { color: var(--c-deep-ink); }
.site-footer__disclaimer {
  font-size: var(--fs-small);
  color: rgb(232 234 244 / .72); /* --c-deep 위 ≈ 8.4:1, hub-footer__disclaimer와 동일 톤 */
  max-width: 70ch;
}
.site-footer__copyright {
  font-size: var(--fs-small);
  color: rgb(232 234 244 / .5);
  border-top: 1px solid rgb(232 234 244 / .1);
  padding-top: var(--sp-6);
}

/* ============================ 5. 반응형 ============================ */
/* 태블릿 640px+ */
@media (min-width: 640px) {
  .nav__links { display: flex; gap: var(--sp-6); }
  .nav__cta { display: inline-flex; }

  .hero__cta { flex-direction: row; }
  .hero__cta .btn { width: auto; }

  .values { grid-template-columns: repeat(2, 1fr); }
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }

  .cta__form { flex-direction: row; }

  .site-footer__inner {
    grid-template-columns: 1fr auto;
    align-items: start;
    column-gap: var(--sp-10);
  }
  .site-footer__disclaimer { grid-column: 1 / -1; }
  .site-footer__copyright { grid-column: 1 / -1; }
}

/* 데스크톱 1024px+ */
@media (min-width: 1024px) {
  .nav__links { gap: var(--sp-8); }

  .values { grid-template-columns: repeat(3, 1fr); }
  .pillar-grid { grid-template-columns: repeat(4, 1fr); }

  .stepper__panels { grid-template-columns: repeat(4, 1fr); }

  .global__grid { grid-template-columns: 1.1fr 0.9fr; }
}

/* ============================ 6. 접근성 · 모션 ============================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  /* 리빌·진입: 즉시 최종 상태 */
  .reveal { opacity: 1; transform: none; }
  .hero__content > * { opacity: 1; transform: none; }
  /* hero 앰비언트 흐름 정지 */
  .hero__flow { animation: none; stroke-dasharray: none; opacity: .6; }
  /* journey: 길 완전히 그려진 상태 + 전체 표시, 노드 팝 제거(색·상태만 전환) */
  .stepper__rail-fill { transform: translateY(-50%) scaleX(1); }
  .stepper__card { opacity: 1; }
  .stepper__node.is-active { animation: none; transform: none; }
  /* KO/EN 데모: 현재 언어만 정적 (JS가 data-show 유지) */
  .lang-demo__line { transition: none; }
}

/* ============================ 7. HUB (허브 페이지 + 메인 hubs 섹션) ============================ */

/* 서비스 포인트 컬러 — 기본값 = 시스템 토큰(비허브·미스코프 무영향).
   대비 검증(라이트 bg #FAFAFC): ink 텍스트 ≥5.6:1, accent 그래픽 ≥3:1. 다크 hero: accent ≥5.4:1. */
:root { --hub-accent: var(--c-accent); --hub-accent-ink: var(--c-primary); }
[data-hub="gemini"] { --hub-accent: #8A78F5; --hub-accent-ink: #5D48D6; }
[data-hub="claude"] { --hub-accent: #D07249; --hub-accent-ink: #A6482B; }
[data-hub="openai"] { --hub-accent: #10A385; --hub-accent-ink: #0A6E5A; }
/* 허브 페이지 전체: "길" 그라디언트 종점을 서비스색으로 (버튼·라인 공통) */
body[data-hub] { --grad-path: linear-gradient(135deg, var(--c-primary), var(--hub-accent)); }

/* 허브 스코프 내 eyebrow만 서비스색 (기존 .eyebrow/.hero__eyebrow 규칙 비수정, 스코프 한정) */
[data-hub] .eyebrow { color: var(--hub-accent-ink); }
[data-hub] .hero__eyebrow { color: var(--hub-accent); }

/* 외부 링크 아이콘 (↗) */
.ext-icon { width: 16px; height: 16px; flex: 0 0 auto; }

/* ---- 허브 hero 정적 "길" 비주얼 (애니메이션 없음, currentColor=서비스색) ---- */
.hub-hero__path { position: absolute; right: -12%; top: 0; width: 75%; height: 100%; color: var(--hub-accent); opacity: .5; }
.hub-hero__path path { stroke: currentColor; }
.hub-hero__path circle { fill: currentColor; }

/* ---- what (2문단) ---- */
.what { background: var(--c-bg); }
.what__body { max-width: 65ch; color: var(--c-ink-soft); }
.what__body + .what__body { margin-top: var(--sp-6); }

/* ---- start (넘버드 패스 · 비인터랙티브 · 정적) ---- */
.start { background: var(--c-surface); }
.start-steps {
  position: relative;
  max-width: 640px;
  display: grid;
  gap: var(--sp-8);
  margin: 0;
  padding: 0;
}
/* 세로 "길" 라인 — 리빌 시 위→아래로 그려짐(scaleY) */
.start-steps::before {
  content: "";
  position: absolute;
  left: 22px; top: 24px; bottom: 24px;
  width: 2px;
  background-image: var(--grad-path);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 800ms var(--ease-out);
}
.start-steps.is-visible::before { transform: scaleY(1); }
.start-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: var(--sp-5);
  align-items: start;
}
.start-step__node {
  position: relative;
  z-index: 1;
  width: 46px; height: 46px;
  display: inline-flex;
  align-items: center; justify-content: center;
  border-radius: var(--r-pill);
  background-image: var(--grad-path);
  color: var(--c-primary-ink);
  font-weight: 700;
  font-size: 1.0625rem;
}
.start-step__title { font-size: 1.0625rem; font-weight: 700; margin-bottom: var(--sp-1); padding-top: 8px; }
.start-step__desc { color: var(--c-ink-soft); font-size: var(--fs-small); line-height: 1.65; }

/* ---- use (4카드 · 3허브 동일 · 카드 재사용) ---- */
.use { background: var(--c-bg); }
.use-grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); align-items: stretch; }
.use-card {
  position: relative;
  display: flex; flex-direction: column; align-items: flex-start; gap: var(--sp-3);
  padding: var(--sp-8);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out);
}
.use-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--hub-accent);
}
.use-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); }
.use-card__icon {
  display: inline-flex; width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--hub-accent-ink);
  margin-top: var(--sp-1);
}
.use-card__icon svg { width: 26px; height: 26px; }
.use-card__title { font-size: 1.0625rem; font-weight: 700; }
.use-card__body { color: var(--c-ink-soft); font-size: var(--fs-small); line-height: 1.65; }

/* ---- links (외부 링크 2 · 리스트) ---- */
.links { background: var(--c-surface); }
.link-list { display: grid; gap: var(--sp-3); max-width: 560px; }
.link-item {
  display: flex; align-items: center; gap: var(--sp-4);
  min-height: 44px;
  padding: var(--sp-4) var(--sp-6);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-surface);
  color: var(--c-ink);
  font-weight: 600;
  transition: border-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.link-item span:first-child { flex: 1 1 auto; }
.link-item:hover { border-color: var(--hub-accent); color: var(--hub-accent-ink); }
.link-item__ext { color: var(--hub-accent-ink); transition: transform var(--dur-fast) var(--ease-out); }
.link-item:hover .link-item__ext { transform: translateX(2px); }

/* ---- 허브 footer (다크 · back + disclaimer + copyright) ---- */
.hub-footer { background: var(--c-deep); color: rgb(232 234 244 / .62); padding-block: var(--sp-16) var(--sp-10); }
.hub-footer__inner { display: grid; gap: var(--sp-6); }
.hub-footer__back {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  color: var(--c-deep-ink); font-weight: 600; width: fit-content;
  transition: color var(--dur-fast) var(--ease-out);
}
.hub-footer__back svg { width: 18px; height: 18px; }
.hub-footer__back:hover { color: var(--hub-accent); }
.hub-footer__disclaimer { font-size: var(--fs-small); color: rgb(232 234 244 / .72); max-width: 70ch; }
.hub-footer__copyright { font-size: var(--fs-small); color: rgb(232 234 244 / .5); }

/* ---- 메인 hubs 연결 섹션 (라이트) ---- */
.hubs { background: var(--c-bg); }
.hub-grid { display: grid; grid-template-columns: 1fr; gap: var(--sp-6); align-items: stretch; }
.hub-grid__item { display: flex; }
.hub-card {
  position: relative;
  display: flex; flex-direction: column; align-items: flex-start; gap: var(--sp-3);
  width: 100%;
  padding: var(--sp-8);
  background: var(--c-surface);
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  color: var(--c-ink);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}
.hub-card__bar { position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--hub-accent); }
.hub-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card-hover); border-color: var(--hub-accent); }
.hub-card__mark {
  display: inline-flex; width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--hub-accent); margin-top: var(--sp-1);
}
.hub-card__mark svg { width: 28px; height: 28px; }
.hub-card__name { font-size: 1.1875rem; font-weight: 700; }
.hub-card__desc { color: var(--c-ink-soft); font-size: var(--fs-small); line-height: 1.65; }
.hub-card__cta {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  margin-top: auto; padding-top: var(--sp-2);
  color: var(--hub-accent-ink); font-weight: 600; font-size: var(--fs-small);
}
.hub-card__arrow { width: 18px; height: 18px; transition: transform var(--dur-fast) var(--ease-out); }
.hub-card:hover .hub-card__arrow { transform: translateX(3px); }

/* ---- 허브 반응형 ---- */
@media (min-width: 640px) {
  .use-grid { grid-template-columns: repeat(2, 1fr); }
  .hub-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
  .use-grid { grid-template-columns: repeat(4, 1fr); }
  .hub-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ---- 허브 reduced-motion (start 라인 정적 · 외부 아이콘 이동 제거) ---- */
@media (prefers-reduced-motion: reduce) {
  .start-steps::before { transform: scaleY(1); }
  .link-item__ext, .hub-card__arrow { transition: none; }
}